Expected value with empirical probabilities

Find expected value based on empirical probabilities.
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Divya spends all of her free time playing with her building blocks. She owns building block sets with 3 pieces, 5 pieces, and 10 pieces.
Divya knows she owns 5 sets with 5 pieces and 2 sets with 10 pieces. She also knows that she averages 5 pieces per set. This information is summarized in the table below.
Fill in the missing blank with how many sets with 3 pieces Divya owns.
Pieces in a setSets
  • Your answer should be
  • an integer, like 6
  • an exact decimal, like 0, point, 75
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4